Acts 1:1-5 - The Preface
1 The first account which I drew up, Theophilus, dealt with all that Jesus did and taught from the very first, 2 Down to that day on which he was taken up to Heaven, after he had, by the help of the Holy Spirit, given instructions to the Apostles whom he had chosen. 3 With abundant proofs, he showed himself to them, still living, after his death; appearing to them from time to time during forty days, and speaking of all that related to the Kingdom of God.
4 And once, when he had gathered them together, he charged them not to leave Jerusalem, but to wait there for the fulfillment of the Father's promise-- "that promise," he said, "of which you have heard me speak; 5 For, while John baptized with water, you shall be baptized with the Holy Spirit before many days have passed."